LA-ICP-MS zircon U-Pb age of dykes from central Tarim Basin and its geological significance

Seismic data obtained from the central Tarim Basin show that lots of diabase dykes are developed in Cambrian, Ordovician and Permian strata.Diabase dykes that invaded into Silurian and Ordovician strata were collected near the fault zone (Zhong 1 well, Zhong 16 well core).Using LA-ICP-MS determination technology, the authors determined U-Pb age and trace elements in zir-con.Zircon U-Pb age shows that the diabase dykes were formed in the Early Permian period of 273~296 Ma.Measured 700~930 Ma (Late Proterozoic) and 396~544 Ma (Paleozoic) show the tectonic-magmatic activity when basin was formed.121.0±8.5 Ma (Early Cretaceous) zircon indicates that the formation was related to hydrothermal activities in the same period.